ORA Variegated Urchin

Quick facts

Handling caution: Spines are generally short and blunt but can still puncture skin; handle with care to avoid irritation

Identity

Also known as

Variegated Sea Urchin; Green Urchin; Pincushion Urchin

Synonyms

Toxopneustes variegatus

Environment

Saltwater

Native to

United States (North Carolina, Florida), Bermuda, Gulf of Mexico, Caribbean Sea, Brazil

Habitat

Seagrass meadows, sandy lagoons, and shallow coral reef margins from the surface down to about 50 meters

Sourcing

Both

Conservation

Not Evaluated

Care

Care level

Easy

Temperament

Peaceful

Adult size

2 – 4 in (5.1 – 10 cm)

Lifespan

3 – 5 yrs

Min tank

30 gal (114 L)

Growth rate

Moderate

Placement

Bottom, Rock & glass

Water

Temperature

72 – 79 °F (22 – 26 °C)

pH

8.1 – 8.4

dKH

8 – 12 dKH

Salinity

1.023 – 1.026 SG

Flow

Moderate

Behavior & compatibility

Social

Solitary

Aggression to own kind

Low

Active

Night

Reef safe

With caution

Invert safe

With caution

Shrimp safe

Yes

Clean-up role

Algae, Detritus

Population boom risk

Low

Feeding & breeding

Diet

Herbivore

Foods

Algae, Vegetables, Freeze-dried, Pellets

Breeding type

Broadcast spawner

Breeding difficulty

Not bred in captivity

Sexing

Sexes cannot be distinguished externally

Target feeding

Beneficial

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Care guide

Overview

Grazes continuously across rock, sand, and glass, often piling shell bits or rubble atop its test as camouflage while it works through algae film. This aquacultured line offers a captive-raised alternative to wild-collected stock, with the same short, blunt spines and green-to-purple coloring typical of the species. Best suited to established reef or FOWLR systems with secure rockwork and no copper exposure.

Care

This urchin is a tireless grazer that patrols rock, glass, and sand looking for algae film and diatoms, making it one of the more efficient cleanup animals for systems with persistent hair or film algae. It needs a mature tank with established algae growth or supplemental feeding once that supply runs low, and rockwork should be stacked securely since it will bulldoze loose pieces while foraging. Stable salinity and calcium/magnesium levels matter for test and spine health, and copper-based medications must never be used in a tank housing this species.

Feeding

Offer dried seaweed sheets clipped to rock or glass, along with herbivore pellets, once natural algae growth becomes scarce. It will also pick at detritus and diatoms on its own, but growth and spine condition suffer if the diet is too limited for extended periods. Avoid overfeeding with foods high in phosphate since nutrient spikes can quickly affect a reef system.

Tank mates

Generally peaceful with fish and corals, though it may bump or move unsecured frags and light rubble as it travels through the tank. It is best avoided with large wrasses, triggerfish, and puffers, all of which are known to flip and eat urchins. If algae supply drops low, it may begin picking at coralline algae or, occasionally, sessile invertebrates, so monitor food availability closely in a reef setup.

Breeding

Reproduction in a home aquarium is essentially never achieved, as this species is a broadcast spawner that releases eggs and sperm into open water for external fertilization. The resulting larvae are planktonic and require specialized phytoplankton feeding and controlled conditions to survive, which home systems cannot reliably provide. Nearly all specimens in the trade are the product of commercial aquaculture rather than aquarium breeding.

Health

Loss of spines or a dull, deflated appearance is usually a sign of poor water quality or insufficient food, and can precede tissue decline if not corrected. This species is highly sensitive to copper exposure and to sudden shifts in salinity, both of which can be fatal or badly stress the animal. A slow drip acclimation on introduction reduces the risk of shock from specific gravity mismatches.

Sources

1. Variegated Urchin Invertebrate Care Guide | Top Shelf Aquatics
2. Ko-fi - Lytechinus variegatus
3. Pincushion Urchin (Lytechinus variegatus) – Little Shop of Coral
4. Pincushion Urchin (Lytechinus variegatus) - The Aquarium Wiki